<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<!-- 1. 外链 -->
		<link rel="stylesheet" type="text/css" href="css/my.css"/>
		<!-- 2. 导入 -->
		<style type="text/css">
			@import url("css/your.css");
		</style>
		<!-- 3. 内部 -->
		<style type="text/css">
			div{
				color: blue;
			}
		</style>
	</head>
	<body>
		<div>111</div>
		<div>222
			<span>XXXX</span>
		</div>
		<!-- 4. 行内 -->
		<div style="color: red;">333</div> 
		<p>444</p>
	</body>
</html>
